Peter from Kodak just replied to my email about Portra 800.

I see that the technical datasheet E-4040 for the Kodak Professional Portra
Films, (160NC/160VC/400NC/400VC/800) is now listed under the discontinued
publications list, but the Kodak Professional Portra 800 Film continues to be
available in 120 and 135.
Just to squash any rumors before they start